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The U.S. Department of Justice has subpoenaed a high-profile whistleblower in its criminal investigation into Wells Fargo & Co’s (WFC.N) opening of accounts without customer permission. U.S. prosecutors in San Francisco have asked Wells Fargo banker Yesenia Guitron, who lost a private lawsuit against the fourth-largest lender, to testify before a grand jury in San Francisco on Tuesday, according to a subpoena dated Dec.